6XC

Speed Converter (km/h, mph, knots)

Convert between km/h, mph, m/s, knots and ft/s instantly — all units shown at once, with exact factors.

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Every Speed Unit at Once

Type a value, pick its unit, and read the answer in all the others simultaneously: km/h and mph for road speeds, m/s for physics and wind, knots for aviation and sailing, ft/s for US engineering. Conversion uses exact definitions (1 mph = 1.609344 km/h, 1 knot = 1.852 km/h) — not rounded shortcuts.

The classics it answers: a 70 mph US speed limit is 112.7 km/h; a 20-knot wind is 37 km/h; a 10 m/s sprint is 36 km/h. Everything runs in your browser.

Frequently Asked Questions

Why do sailors and pilots use knots?

One knot is one nautical mile per hour, and a nautical mile is one minute of latitude — which makes speed and chart distance line up naturally in navigation.

Are the factors exact?

Yes: the mile is defined as exactly 1.609344 km and the nautical mile as exactly 1852 m, so mph and knot conversions are exact by definition, not approximations.

How do I convert a running pace like min/km?

Pace is time per distance — the inverse of speed. Use our Running Pace Calculator for min/km ↔ min/mi; this tool covers distance-per-time units.

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